3x^2-12x=0. Find the value of x

Question

Need help with factoring!!!

Answer 1

3x² - 12x = (3·x·x - 3·4·x)

 

Each term in the parentheses has a 3x in common, so factor that out.  If you take 3x out of the first term, it leaves an x.  If you take 3x out of the second terms it leaves the 4:

 

3x² - 12x = (3·x·x - 3·4·x) = 3x(x-4) = 0

 

True when x = 0 and x = 4.